Moving boundary simulation by interpolated bounce back scheme based on multi-relaxation time lattice Boltzmann method

Flow around a moving cylinder was simulated with interpolated bounce back scheme using the frame of multi-relaxation time lattice Boltzmann method. The flow variables on newly generated fluid grid due to cylinder moving were estimated with non-equilibrium extrapolation method: the density distributing populations were calculated according to cylinder velocity and the density on the flow domain grid, which points to the wall perpendicularly. In the frame of frequency analysis, the new method was compared to the traditional scheme. The results show that the presented method is more accurate and that less information in the domain is needed. The frequency analysis also shows the cause of the errors of the method, which can be regarded as a basis for future improvement. In addition, larger Reynolds number tests show that increasing the size of the simulation domain can dramatically reduce errors in the low frequency region.